PayPal Standard plugin sends all information with payment details to PayPal server and it is visible in PayPal form - PayPal standard plugin lets customers shop on your PBA-S Store and checkout on PayPal.

PayPal Express checkout fetching payment ID from PayPal first, Payment form with Payment ID appears in PBA-S Control panel to checkout and redirecting customer to PayPal to pay this payment, so PayPal Express checkout works in the following way:

after selecting products to purchase, customers click Checkout with PayPal in PBA-S Control Panel/Store.

they are transferred to PayPal, where they select their payment method, as well as the correct shipping and billing address, then are returned to your website to complete their purchase.

PayPal automatically provides PBA-S system with the shipping address, email, and other customer information needed to fulfill order in PBA-S system.